At least one of the Facebook ads bought by Russians during the 2016 [residential campaign referenced Black Lives Matter and was specifically targeted to reach audiences in Ferguson, Missouri, and Baltimore, sources with knowledge of the ads told CNN. Ferguson and Baltimore had gained widespread attention for the large and violent protests over police shootings of Black men. The decision to target the ad in those two cities offers the first look at how accounts linked to the Russian government-affiliated troll farm known as the Internet Research Agency used geographically targeted advertising to sow political chaos in the United States, the sources said. Facebook has previously said that roughly one-quarter of the 3,000 ads bought by the agency were geographically targeted, but it has not revealed any specific locations. Facebook has also not revealed which demographic groups and interest groups were targeted by the ads. The Black Lives Matter ad appeared on Facebook at some point in late 2015 or early 2016, the sources said. The sources said it appears the ad was meant to appear both as supporting Black Lives Matter but also could be seen as portraying the group as threatening to some residents of Baltimore and Ferguson.